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Note 10 - Leasing Activities (Tables)
12 Months Ended
Dec. 31, 2016
Notes Tables  
Schedule of Future Minimum Lease Payments for Capital Leases and Operating Leases [Table Text Block]
   
Capital
Leases
   
Operating
Leases
 
2017
  $
17,029
    $
819
 
2018
   
17,657
     
672
 
2019
   
18,264
     
602
 
2020
   
16,977
     
342
 
2021
   
10,936
     
342
 
Thereafter
   
11,659
     
190
 
                 
Total minimum lease payments
  $
92,522
    $
2,967
 
Less amount representing interest
   
(8,029
)    
 
 
Present value of net minimum capital lease payments
   
84,493
     
 
 
Less current portion
   
(14,449
)    
 
 
Obligations under capital leases less current portion
  $
70,044
     
 
 
Schedule of Future Minimum Rental Receivable for Operating Leases [Table Text Block]
2017
  $
121,335
 
2018
   
103,092
 
2019
   
81,532
 
2020
   
58,660
 
2021
   
34,083
 
Thereafter
   
17,257
 
         
Total
  $
415,959
 
Operating Leases of Lessee Disclosure [Table Text Block]
2017
  $
8,180
 
2018
   
6,341
 
2019
   
4,639
 
2020
   
3,404
 
2021
   
1,899
 
Thereafter
   
16,336
 
         
Total
  $
40,799